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It causes tremors and muscular rigidity or stiffness, and affects all kinds of movement in the body.

About 10,000 new sufferers are diagnosed each year. There is no cure, but drugs and surgery can help control symptoms.

Parkinson's disease causes tremors and muscular rigidity or stiffness, and affects all kinds of movement in the body (file picture)

About 130,000 men and women took part
in the research, published in the journal Neurology, of whom 800 had
developed Parkinson’s disease during 20 years of follow-up.

It involved an analysis of their diets
and, adjusting for age and lifestyle, men volunteers who ate the most
flavonoids were shown to be 40 per cent less likely to develop the
disease than those who ate the least.

The study found no similar link for total flavonoid intake in women.

Antioxidants help to neutralise free radicals – destructive by-products of metabolism in the body that can damage cell membranes and DNA.

Brain cells are particularly sensitive to free radicals – which may help to explain the benefits revealed by the study.

It found the main protective effect came from higher intakes of anthocyanins – a type of flavonoid – present in berries and other fruits and vegetables such as aubergines.

Men who ate one or more portions of berries each week were 24 per cent less likely to develop Parkinson’s disease, relative to those who did not eat the fruits, the experts said.

Dr Xiang Gao of Harvard School of Public Health, one of the study leaders, said the findings suggest that anthocyanins ‘may have neuro- protective effects’.

He added: ‘Given the other potential health effects of berry fruits, such as lowering risk of hypertension as reported in our previous studies, it is good to regularly add these fruits to your diet.’

His colleague Professor Aedin Cassidy, of Norwich Medical School at the University of East Anglia, described their findings as ‘exciting’.

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Eating berries can cut men's risk of Parkinson's disease by 40 per cent